You're at risk of familial adenomatous polyposis if you have a parent, child, brother or sister with the condition. If you're at risk, it's important to be screened frequently, starting in childhood. Annual exams can detect the growth of polyps before they become cancerous.


  • Sigmoidoscopy. A flexible tube is inserted into your rectum to inspect the rectum and sigmoid — the last two feet of the colon. For people with a genetic diagnosis of FAP or family members at risk who haven't had genetic testing, the American College of Gastroenterology recommends annual sigmoidoscopy, beginning at ages 10 to12 years.
  • Colonoscopy. A flexible tube is inserted into your rectum to inspect the entire colon. Once polyps are found in your colon, you need to have an annual colonoscopy until you have surgery to remove your colon.
  • Esophagogastroduodenoscopy (EGD) and side-viewing duodenoscopy. Two types of scopes are used to inspect your esophagus, stomach and upper part of the small intestine (duodenum and ampulla). The doctor may remove a small tissue sample (biopsy) for further study.
  • CT or MRI. Imaging of the abdomen and pelvis may be used, especially to evaluate desmoid tumors.

Genetic testing

A simple blood test can determine if you carry the abnormal gene that causes FAP. Genetic testing may also detect whether you're at risk of complications of FAP. Your doctor may suggest genetic testing if:

  • You have family members with FAP
  • You have some, but not all, of the signs of FAP

Ruling out FAP spares at-risk children years of screening and emotional distress. For children who do carry the gene, appropriate screening and treatment greatly reduce the risk of cancer.

Additional tests

Your doctor may recommend thyroid exams and other tests to detect other medical problems that can occur if you have FAP.


At first, your doctor will remove any small polyps found during your colonoscopy exam. Eventually, though, the polyps will become too numerous to remove individually, usually by your late teens or early 20s. Then you will need surgery to prevent colon cancer. You will also need surgery if a polyp is cancerous. You may not need surgery for AFAP.

Minimally invasive colorectal surgery

Your surgeon may decide to perform your surgery laparoscopically, through several small incisions that require just a stitch or two to close. This minimally invasive surgery usually shortens your hospital stay and allows you to recover more quickly.

Depending on your situation, you may have one of the following types of surgery to remove part or all of the colon:

  • Subtotal colectomy with ileorectal anastomosis, in which the rectum is left in place
  • Total proctocolectomy with a continent ileostomy, in which the colon and rectum are removed and an opening (ileostomy) is created, usually on the right side of your abdomen
  • Total proctocolectomy with ileoanal anastomosis (also called J-pouch surgery), in which the colon and rectum are removed and a part of the small intestine is attached to the rectum

Follow-up treatment

Surgery doesn't cure FAP. Polyps can continue to form in the remaining or reconstructed parts of your colon, stomach and small intestine. Depending on the number and size of the polyps, having them removed endoscopically may not be enough to reduce your risk of cancer. You may need additional surgery.

You will need regular screening — and treatment if needed — for the complications of familial adenomatous polyposis that can develop after colorectal surgery. Depending on your history and the type of surgery you had, screening may include:

  • Sigmoidoscopy or colonoscopy
  • Upper endoscopy
  • Thyroid ultrasound
  • CT or MRI to screen for desmoid tumors

Depending on your screening results, your doctor may additional treatments for the following issues:

  • Duodenal polyps and periampullary polyps. Your doctor may recommend surgery to remove the upper part of the small intestine (duodenum and ampulla) because these types of polyps can progress to cancer.
  • Desmoid tumors. You may be given a combination of medications, including nonsteroidal anti-inflammatory drugs, anti-estrogen and chemotherapy. In some cases, you may need surgery.
  • Osteomas. Doctors may remove these noncancerous bone tumors for pain relief or cosmetic reasons.

Potential future treatments

Researchers continue to evaluate additional treatments for FAP. In particular, the use of pain relievers such as aspirin and nonsteroidal anti-inflammatory drugs (NSAIDs), as well as a chemotherapy drug, are being investigated.

Coping and support

Some people find it helpful to talk with others who share similar experiences. Consider joining an online support group, or ask your doctor about support groups in your area.

Preparing for your appointment

What you can do

Your time with your doctor may be limited, so try to prepare a list of questions. For FAP, some basic questions to ask your doctor may include:

  • What are the chances that I will pass the condition on to my children?
  • How often will I need to have screening?
  • What kind of tests will my screening involve?
  • Will I need surgery?
  • If I need surgery, when will I need it?
  • What kind of surgery will I need?
  • Will surgery cure my FAP?
  • If not, what follow-up and treatment will I need?
  • How accurate is genetic testing?

Familial adenomatous polyposis care at Mayo Clinic

June 30, 2021

Living with familial adenomatous polyposis?

Connect with others like you for support and answers to your questions in the Colorectal Cancer support group on Mayo Clinic Connect, a patient community.

Colorectal Cancer Discussions

Hemicolectomy: Experiencing spasms and muscle cramps, why?

15 Replies Thu, Nov 30, 2023

Hepatic artery infusion chemotherapy (HAIC) pump for liver mets

14 Replies Thu, Nov 30, 2023

Sigmoid colon resection: What to expect for recovery?

228 Replies Tue, Nov 28, 2023

See more discussions
  1. Chung DC, et al. Clinical manifestations and diagnosis of familial adenomatous polyposis. https://www.uptodate.com/contents/search. Accessed June 4, 2018.
  2. Familial adenomatous polyposis. Cancer.Net. http://www.cancer.net/cancer-types/familial-adenomatous-polyposis. Accessed June 4, 2018.
  3. Kanth P, et al. Hereditary colorectal polyposis and cancer syndromes: A primer on diagnosis and management. American Journal of Gastroenterology. 2017; 112:1509.
  4. Ferri FF. Familial adenomatous polyposis and Gardner's syndrome. In: Ferri's Clinical Advisor 2019. Philadelphia, Pa.: Elsevier; 2019. https://www.clinicalkey.com. Accessed June 4, 2018.
  5. Ravi V, et al. Desmoid tumors: Epidemiology, risk factors, molecular pathogenesis, clinical presentation, diagnosis, and local therapy. https://www.uptodate.com/contents/search. Accessed June 4, 2018.
  6. Chung DC, et al. Familial adenomatous polyposis: Screening and management of patients and families. https://www.uptodate.com/contents/search. Accessed June 4, 2018.
  7. Genetic and Rare Diseases Information Center (GARD). Familial adenomatous polyposis. https://rarediseases.info.nih.gov/diseases/6408/familial-adenomatous-polyposis. Accessed June 4, 2018.
  8. Chintalacheruvu LM, et al. Major hereditary gastrointestinal cancer syndromes: A narrative review. Journal of Gastrointestinal Liver Disease. 2017;26:157.
  9. Attenuated familial adenomatous polyposis. Genetic and Rare Diseases Information Center (GARD). https://rarediseases.info.nih.gov/diseases/8532/attenuated-familial-adenomatous-polyposis. Accessed June 4, 2018.
  10. Syngal S, et al. ACG clinical guideline: Genetic testing and management of hereditary gastrointestinal cancer syndromes. American Journal of Gastroenterology. 2015;110: 223.
  11. Brown AY. Allscripts EPSi. Mayo Clinic, Rochester, Minn. March 28, 2018.
  12. Ravi V, et al. Desmoid tumors: Systemic therapy. https://www.uptodate.com/contents/search. Accessed June 4, 2018.
  13. Picco MF (expert opinion). Mayo Clinic, Jacksonville, Fla. July 1, 2018.


Products & Services